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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a07910d1a898a7f95ff7512225fa1d44b92f1d4a8923931267ac9e09be59ac4' 
  AND token = 'POZSIM4qxZZCv3gTD4FZCMoyo4xoJPpU7qcits4TmF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}